diff --git a/server/StudySharp.ApplicationServices/Commands/Auth/RegisterNewUserCommand.cs b/server/StudySharp.ApplicationServices/Commands/Auth/RegisterNewUserCommand.cs
index 812bb58..a99b9d7 100644
--- a/server/StudySharp.ApplicationServices/Commands/Auth/RegisterNewUserCommand.cs
+++ b/server/StudySharp.ApplicationServices/Commands/Auth/RegisterNewUserCommand.cs
@@ -65,7 +65,7 @@ public async Task<OperationResult> Handle(RegisterNewUserCommand request, Cancel
                 return OperationResult.Fail(userRegisteredResult.Errors.Select(_ => _.Description).ToList());
             }
 
-            var userObtainedRoleStudentResult = await _userManager.AddToRoleAsync(newUser, DomainRoles.Student.ToString());
+            var userObtainedRoleStudentResult = await _userManager.AddToRoleAsync(newUser, DomainRoles.DomainUser.ToString());
 
             if (!userObtainedRoleStudentResult.Succeeded)
             {
diff --git a/server/StudySharp.Domain/Enums/DomainRoles.cs b/server/StudySharp.Domain/Enums/DomainRoles.cs
index 74ccc8a..4229027 100644
--- a/server/StudySharp.Domain/Enums/DomainRoles.cs
+++ b/server/StudySharp.Domain/Enums/DomainRoles.cs
@@ -2,9 +2,8 @@
 {
     public enum DomainRoles
     {
-        Unknown = 0,
-        Teacher = 1,
-        Student = 2,
+        DomainUser = 1,
+        Teacher = 2,
         Moderator = 3,
         Admin = 4,
     }
diff --git a/server/StudySharp.Domain/Models/AppearanceType.cs b/server/StudySharp.Domain/Models/AppearanceType.cs
new file mode 100644
index 0000000..2462b29
--- /dev/null
+++ b/server/StudySharp.Domain/Models/AppearanceType.cs
@@ -0,0 +1,9 @@
+namespace StudySharp.Domain.Models
+{
+    public enum AppearanceType
+    {
+        IsPublic = 1,
+        IsPrivate = 2,
+        IsInternal = 3,
+    }
+}
diff --git a/server/StudySharp.Domain/Models/Course.cs b/server/StudySharp.Domain/Models/Course.cs
index ddbd1f4..ec95c10 100644
--- a/server/StudySharp.Domain/Models/Course.cs
+++ b/server/StudySharp.Domain/Models/Course.cs
@@ -9,8 +9,11 @@ public sealed class Course : IWithDateCreated, IWithDateModified
         public int Id { get; set; }
         public string Name { get; set; }
         public List<Tag> Tags { get; set; }
-        public int TeacherId { get; set; }
+        public int? TeacherId { get; set; }
         public Teacher Teacher { get; set; }
+        public int? OrganizationId { get; set; }
+        public Organization Organization { get; set; }
+        public AppearanceType Appearance { get; set; }
         public List<TheoryBlock> TheoryBlocks { get; set; }
         public List<PracticalBlock> PracticalBlocks { get; set; }
         public DateTimeOffset DateCreated { get; private set; }
diff --git a/server/StudySharp.Domain/Models/DomainUser.cs b/server/StudySharp.Domain/Models/DomainUser.cs
new file mode 100644
index 0000000..89465df
--- /dev/null
+++ b/server/StudySharp.Domain/Models/DomainUser.cs
@@ -0,0 +1,12 @@
+namespace StudySharp.Domain.Models
+{
+    public sealed class DomainUser
+    {
+        public int Id { get; set; }
+        public int AppUserId { get; set; }
+        public int? TeacherId { get; set; }
+        public Teacher Teacher { get; set; }
+        public string FirstName { get; set; }
+        public string LastName { get; set; }
+    }
+}
diff --git a/server/StudySharp.Domain/Models/Organization.cs b/server/StudySharp.Domain/Models/Organization.cs
new file mode 100644
index 0000000..2bf6841
--- /dev/null
+++ b/server/StudySharp.Domain/Models/Organization.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using StudySharp.Domain.Contracts;
+
+namespace StudySharp.Domain.Models
+{
+    public sealed class Organization : IWithDateCreated
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public string Description { get; set; }
+        public int OwnerId { get; set; }
+        public OrganizationStatus Status { get; set; }
+        public DateTimeOffset DateCreated { get; private set; }
+        void IWithDateCreated.SetDateCreated(DateTimeOffset value) => DateCreated = value;
+        public List<DomainUser> Members { get; set; }
+    }
+}
diff --git a/server/StudySharp.Domain/Models/OrganizationRepresentative.cs b/server/StudySharp.Domain/Models/OrganizationRepresentative.cs
new file mode 100644
index 0000000..694ec0b
--- /dev/null
+++ b/server/StudySharp.Domain/Models/OrganizationRepresentative.cs
@@ -0,0 +1,12 @@
+namespace StudySharp.Domain.Models
+{
+    public sealed class OrganizationRepresentative
+    {
+        public int OrganizationId { get; set; }
+        public int MemberId { get; set; }
+        public bool CanCreate { get; set; }
+        public bool CanEdit { get; set; }
+        public bool CanDelete { get; set; }
+        public bool IsOrganizationManager { get; set; }
+    }
+}
diff --git a/server/StudySharp.Domain/Models/OrganizationStatus.cs b/server/StudySharp.Domain/Models/OrganizationStatus.cs
new file mode 100644
index 0000000..9b888d2
--- /dev/null
+++ b/server/StudySharp.Domain/Models/OrganizationStatus.cs
@@ -0,0 +1,9 @@
+namespace StudySharp.Domain.Models
+{
+    public enum OrganizationStatus
+    {
+        New = 1,
+        OnConsideration = 2,
+        Confirmed = 3,
+    }
+}
diff --git a/server/StudySharp.Domain/Models/Teacher.cs b/server/StudySharp.Domain/Models/Teacher.cs
index 5a96fc6..46a128e 100644
--- a/server/StudySharp.Domain/Models/Teacher.cs
+++ b/server/StudySharp.Domain/Models/Teacher.cs
@@ -4,10 +4,7 @@ namespace StudySharp.Domain.Models
 {
     public sealed class Teacher
     {
-        public int UserId { get; set; }
         public int Id { get; set; }
-        public string FirstName { get; set; }
-        public string LastName { get; set; }
         public List<Course> Courses { get; set; }
     }
 }
diff --git a/server/StudySharp.DomainServices/Configurations/CourseConfiguration.cs b/server/StudySharp.DomainServices/Configurations/CourseConfiguration.cs
index 992259f..ec4d589 100644
--- a/server/StudySharp.DomainServices/Configurations/CourseConfiguration.cs
+++ b/server/StudySharp.DomainServices/Configurations/CourseConfiguration.cs
@@ -4,7 +4,7 @@
 
 namespace StudySharp.DomainServices.Configurations
 {
-    public class ContentConfiguration : IEntityTypeConfiguration<Course>
+    public sealed class CourseConfiguration : IEntityTypeConfiguration<Course>
     {
         public void Configure(EntityTypeBuilder<Course> builder)
         {
diff --git a/server/StudySharp.DomainServices/Configurations/DomainUserConfiguration.cs b/server/StudySharp.DomainServices/Configurations/DomainUserConfiguration.cs
new file mode 100644
index 0000000..90742d4
--- /dev/null
+++ b/server/StudySharp.DomainServices/Configurations/DomainUserConfiguration.cs
@@ -0,0 +1,28 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using StudySharp.Domain.Models;
+
+namespace StudySharp.DomainServices.Configurations
+{
+    public sealed class DomainUserConfiguration : IEntityTypeConfiguration<DomainUser>
+    {
+        public void Configure(EntityTypeBuilder<DomainUser> builder)
+        {
+            builder
+                .HasKey(_ => _.Id);
+
+            builder
+                .Property(_ => _.FirstName)
+                .IsRequired();
+
+            builder
+                .Property(_ => _.LastName)
+                .IsRequired();
+
+            builder
+                .HasOne(_ => _.Teacher)
+                .WithOne()
+                .HasForeignKey<DomainUser>(_ => _.TeacherId);
+        }
+    }
+}
diff --git a/server/StudySharp.DomainServices/Configurations/OrganizationConfiguration.cs b/server/StudySharp.DomainServices/Configurations/OrganizationConfiguration.cs
new file mode 100644
index 0000000..a995531
--- /dev/null
+++ b/server/StudySharp.DomainServices/Configurations/OrganizationConfiguration.cs
@@ -0,0 +1,15 @@
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using StudySharp.Domain.Models;
+
+namespace StudySharp.DomainServices.Configurations
+{
+    public sealed class OrganizationConfiguration : IEntityTypeConfiguration<Organization>
+    {
+        public void Configure(EntityTypeBuilder<Organization> builder)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/server/StudySharp.DomainServices/Configurations/OrganizationRepresentativeConfiguration.cs b/server/StudySharp.DomainServices/Configurations/OrganizationRepresentativeConfiguration.cs
new file mode 100644
index 0000000..e98cd3b
--- /dev/null
+++ b/server/StudySharp.DomainServices/Configurations/OrganizationRepresentativeConfiguration.cs
@@ -0,0 +1,15 @@
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using StudySharp.Domain.Models;
+
+namespace StudySharp.DomainServices.Configurations
+{
+    public sealed class OrganizationRepresentativeConfiguration : IEntityTypeConfiguration<OrganizationRepresentative>
+    {
+        public void Configure(EntityTypeBuilder<OrganizationRepresentative> builder)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/server/StudySharp.DomainServices/Configurations/QuizConfiguration.cs b/server/StudySharp.DomainServices/Configurations/QuizConfiguration.cs
index 9893a48..a8c89e2 100644
--- a/server/StudySharp.DomainServices/Configurations/QuizConfiguration.cs
+++ b/server/StudySharp.DomainServices/Configurations/QuizConfiguration.cs
@@ -4,7 +4,7 @@
 
 namespace StudySharp.DomainServices.Configurations
 {
-    public class QuizConfiguration : IEntityTypeConfiguration<Quiz>
+    public sealed class QuizConfiguration : IEntityTypeConfiguration<Quiz>
     {
         public void Configure(EntityTypeBuilder<Quiz> builder)
         {
diff --git a/server/StudySharp.DomainServices/Configurations/TagConfiguration.cs b/server/StudySharp.DomainServices/Configurations/TagConfiguration.cs
index 1a53123..04a37f8 100644
--- a/server/StudySharp.DomainServices/Configurations/TagConfiguration.cs
+++ b/server/StudySharp.DomainServices/Configurations/TagConfiguration.cs
@@ -4,7 +4,7 @@
 
 namespace StudySharp.DomainServices.Configurations
 {
-    public class TagConfiguration : IEntityTypeConfiguration<Tag>
+    public sealed class TagConfiguration : IEntityTypeConfiguration<Tag>
     {
         public void Configure(EntityTypeBuilder<Tag> builder)
         {
diff --git a/server/StudySharp.DomainServices/Configurations/TeacherConfiguration.cs b/server/StudySharp.DomainServices/Configurations/TeacherConfiguration.cs
index f475fbd..5c5cee0 100644
--- a/server/StudySharp.DomainServices/Configurations/TeacherConfiguration.cs
+++ b/server/StudySharp.DomainServices/Configurations/TeacherConfiguration.cs
@@ -4,7 +4,7 @@
 
 namespace StudySharp.DomainServices.Configurations
 {
-    public class TeacherConfiguration : IEntityTypeConfiguration<Teacher>
+    public sealed class TeacherConfiguration : IEntityTypeConfiguration<Teacher>
     {
         public void Configure(EntityTypeBuilder<Teacher> builder)
         {
@@ -12,12 +12,9 @@ public void Configure(EntityTypeBuilder<Teacher> builder)
                 .HasKey(_ => _.Id);
 
             builder
-                .Property(_ => _.FirstName)
-                .IsRequired();
-
-            builder
-                .Property(_ => _.LastName)
-                .IsRequired();
+                .HasMany(_ => _.Courses)
+                .WithOne(_ => _.Teacher)
+                .HasForeignKey(_ => _.TeacherId);
         }
     }
 }
diff --git a/server/StudySharp.DomainServices/Configurations/TheoryBlockConfiguration.cs b/server/StudySharp.DomainServices/Configurations/TheoryBlockConfiguration.cs
index f90381d..b6a0c44 100644
--- a/server/StudySharp.DomainServices/Configurations/TheoryBlockConfiguration.cs
+++ b/server/StudySharp.DomainServices/Configurations/TheoryBlockConfiguration.cs
@@ -4,7 +4,7 @@
 
 namespace StudySharp.DomainServices.Configurations
 {
-    public class TheoryBlockConfiguration : IEntityTypeConfiguration<TheoryBlock>
+    public sealed class TheoryBlockConfiguration : IEntityTypeConfiguration<TheoryBlock>
     {
         public void Configure(EntityTypeBuilder<TheoryBlock> builder)
         {
diff --git a/server/StudySharp.DomainServices/StudySharpDbContext.cs b/server/StudySharp.DomainServices/StudySharpDbContext.cs
index 6d539b0..3ff8b1b 100644
--- a/server/StudySharp.DomainServices/StudySharpDbContext.cs
+++ b/server/StudySharp.DomainServices/StudySharpDbContext.cs
@@ -12,6 +12,9 @@ namespace StudySharp.DomainServices
 {
     public class StudySharpDbContext : IdentityDbContext<ApplicationUser, IdentityRole<int>, int>
     {
+        public DbSet<DomainUser> DomainUsers { get; set; }
+        public DbSet<Organization> Organizations { get; set; }
+        public DbSet<OrganizationRepresentative> OrganizationRepresentatives { get; set; }
         public DbSet<Teacher> Teachers { get; set; }
         public DbSet<Course> Courses { get; set; }
         public DbSet<PracticalBlock> PracticalBlocks { get; set; }